When I bought my son a Kubik Roca for Christmas, I added a 'Premium' soft case to the order as these came with good reviews. And, sure enough, it's a nice, soft bag. However, I've since got him one of these 'proper' Kubik cases and it's in a completely different league.
It is only twice the price of other 'cases' but is at least 10 times as good. Firstly, it is completely tailored to the Kubik which means it fits like a glove and allows access to ALL the controls and camera lens without having to remove the Roca itself. It is made from decent quality leather which is thick and protective and looks quite superb.
It is good value at £10, but stonking at less than a fiver! Don't hesitate - treat yourself!
Any gripes? One wee one - it doesn't have a holder for the earphones. But then, it wouldn't be as neat if it had...